Die and die holder



March 25 z 1924.

l487,855 L. B. HASBROUCK DIE AND DIE HOLDER Filed Jan' 24. 1921 20 J 2@Z 303/ //g 43 .4 4,

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SWUQ/wtoz fr@ www @33 M @awww Patented lidar. 25, wget LGUIS B.EASBRO'UCK, OF ELMIR-A, NEW YO RK, ASSIGNOR OFiO-NE-HALF TO HENRY E.

VAN NESS, OF ELMIRA, NEW YORK.

DIE AND DIE HOLDER.

Application filed January 24, 1921. Serial No. 439,514.

T all whom t may concern:

Be it lrnown that l, Louis B. l-lasnnonon, a citizen of the UnitedStates, residing at Elmira, in the county of Ghemung and State of NewYork, have invented certain new and useful Improvements in Dies and DieHolders, fully described and represented in the following specificationand the accompanying drawings7 forming a part of the same. Thisinvention relates to dies and die holders and has for an object toprovide means for cutting a screw thread with great accuracy, and for afurther-object to facilitate the adjustment of the die to determine'thedepth of the thread cut.

According to the invention, a firm support is provided for the front orouter end of the cutting die by arranging the die holder so that itcompletely surrounds the periphery of the die at the front end of thedie and adords means for expanding the die so as to force its edge intofirm contact with the holder.A The die and die holder are provided withcorresponding conical surfaces au which are capable of relativelongitudinal adjustment. The means for expanding the die serves to forceits conical surface into firm contact with the conical surface of theholder in any of the various longitudinal to relations of thesesurfaces. The extent of the expansion necessary to obtain such con tactdepends upon the relative longitudinal position of the conical surfaces,and consequently the diameter to which the die is expanded may beaccurately adjusted by longitudinal adjustment of the conical surfaces.

The firm support provided for the front or outer end of the die not onlyserves to guide the die accurately upon the work, but serves also tocorrect any distortion in the die which may be caused by the heattreatment to which it must be subjected to harden it. Furthermore, thenieans for adjusting the die facilitates fine regulation of the depth ofthe thread cut.

@ther objects and advantages of the invention are hereinafter pointedout in connection with a detailed description of the specific embodimentof the invention which is illustrated in the accompanying drawings, inwhich Fig. 1 is a central longitudinal section of the die and dieholder; and

Fig. 2 is a front end View of the die and die holder.

The die 1 is formed of a single piece of metal and is provided at itsinner periphery with the usual cutting means for forming screw threads.The rear end 2 of the die 1 is perpendicular to the axis of the die,that is to say, to the a-Xis of the cutting teeth of the die. The frontend 3 of the die is preferably also perpendicular to the axis of thedie. Upon the edge of the die is formed a conical surface 4 taperingoutwardly from the front edge 3 of the die. ln order to permit thereversal of the die in the holder it is desirable also to form upon theedge of the die a second cnical surface 5 tapering outwardly from theend 2 of the die. The die contains a longitudinal slot 6 eX- tending itsentire length. This slot tapers inwardly, but its transversecross-section is uniform, that is to say, the sides of the slot lie inplanes containing the axis of the die or planes parallel to the axis. l

The die holder comprises the body 10 having at its forward end anabutment surface 11 perpendicular to its axis, and the hood 2O mountedupon the body and extending forwardly from the abutment surface 11 ofthe body 10. The hood 2O has at its forward end an internal conicalsurface 21. Means are provided for varying the longitudinal position ofthe hood upon the body and thus varying the distance between theabutment surface 11 and the conical surface 21. ln the form shown in thedrawings, this adjustment is obtained by a threaded engagement betweenthe hood and the body. For a purpose hereinafter explained, the

thread upon the body 10 is cut in the saine l direction as the thread tobe cut by the die 1. A lock nut 12 may be screwed upon the body toretain the hood 20 in position after it has been adjusted.

rPhe die 1 is placed in the die holder between the conical surface 21 ofthe hood 20 and the abutment surface 11 of the body 10. A wedge 30 isprovided for expanding the die. In the form shown, this wedge comprisesa pin having a threaded portion 31 engaging a tapped hole 32 in the hoodifi and a tapered portion 33 extending into the slot G of the die l. Asthe wedge is screwed in, its tapered portion 33 expands the die, forcingthe conical surface il of the die into close contact with the conicalsurface 2l of the hood 2O.A rllhis centers the die in the holder andserves to correct any distortion in the die. Furthermore, a lirinsupport is thus afforded for the outer end of the die, and this servesto guide the die accurately upon the work. The contact of the rear endof the die with the abutment surface ll of the body brings the axis ofthe dieV in line with the airis of' the holder.

l/Vhen it is desired to adjust the die, that is to say, slightly tochange its diameter so as torvary the depth of the thread eut, the wedge30 is loosened and the distance between the conical surface 2l of thehood 20 and the abutment surface 1l of the body l0 is varied byscrewingl the hood 20 inwardly or outwardly upon the body l0. rihe hood20 is retained in adjusted position by screwing the lock nut l2 againstit. ll-he wedge 30 is then screwed in until it forces the conicalsurface 4 of the die l into firm contact with the conical surface 2l ofthe hood 20, in the new position of the parts. lt is apparent that, inmaking` adjustments, if the hood 2O is screwed outwardly upon the body10, the resu'ft of expanding the die until the conical surfaces areforced into Contact will be to increase the diameter of the die anddiminish the depth of the thread cut. Conversely, if the hood 20 isscrewed inwardly, less expansion of the die will be necessary to forcethe conical surfaces together so that a deeper thread will be cut. Thus,minute adjustments in the depth of the thread may be made easily andquickly. Furthermore, when the proper adjustment has been secured it maybe retained since the die is firmly locked in position by the wedge lnaddition7 the lock nut 12 serves to prevent any turning,v of the hood 2Ouponthe body 10.

ln order to provide convenient means for mounting' the die holder inlathe, a drillpress, or any other means adapted to rotate it, the bodyl0 ofthe die holder is mounted upon ahollow shank 40. The body 10 has atits rear end a flange 4l which fits around kthe periphery of a shoulder42 at the outer end of the shank 4:0. The body 10 is secured to theshank by rue-ans of ay nut- 4-3 which is screwed upon the body and has aflange 44 engaging' the rear surface of the shoulder 4:2. To facilitatethe attachment of the die holder 'to the shank L10, the body l0 isprovided with a hollow stud 45 which is inserted in the interior of theshank 40 when the die holder is applied to the shank.

Any suitable means may be used for trans- .-ferrine the torque of theshank 40 to the body l0. As shown in the drawings the intense means forthis purpose comprise pins et extending from the outer end of the shankand pins t? extending from the inner end of the body 10, and a drivingdisc- 48 having holes into which the pins 46, 47 extend.

il positive driving connection is provided between the body l0 which isturned by the shank #l0 and the die il. As the threads conne-tingthehood 9,0 to the body 10 are cut in the same direction as the thread tobe cut by the die l, the turning movement of the bodylO tends to screwthe hood '2O further upon the body; but, as inward movement of the hoodwith respect to the bddy is prevented by the engagement of the hood andbody with the die l well as by the lock nut l2, the turning movement ofthe body is transferred to the hood without slippage. The wedgeSO'pr-events the die l from turningin the hood 20. It follows that theturningl movement of the shank 40 is trans- `mittedto the die l withoutslippage.

In addition to the advantages hereinbcfore pointed out it is apparentthat the device described is of simple construction and is inconsequence economical to manufacture. Furthermore, the Vabsence of allslippage and the firm support provided for the die, and particularly forits front end, have proved in practice to `rive the device a hie-hdegree of durability. Y

It should be clearly understood that the invention is by no meanslimited to the specific form and arrangement of parts described.

lVhat is claimed is:

l. The combination of a one-piece die in the form of a split annulus ofsubstantially uniform width and having an externa-l conical surface, adie holder having an internal conical surface. and means for expandingJthe die so as to force its conical surface uniformly into contact withthe conical surface of the die holder.

2. The combination of a die of annular form having a surface ofrevolution at its outer edge and spaced sets of cutting teeth on itsinner edge and recesses extending` radially outward between said sets ofcutting' teeth, each of said recesses terminating at substantially thesame distance from the outer periphery of the die, and a` slot eX-tending from the end of one of said recesses to the outer periphery ofthe die, a die holder havinga surface of revolution adapted to engagethe edge of the die completely around its periphery, and a wedge adaptedto enter the slot in the die and to expand the die so as to force itsouter edge uniformly against said surface of the die holder.

3. The combination of a die of annular form having a conical surface atits outer edge and spaced sets of cuttingr teeth on its inner edge andrecesses extending radially lid i the rear end of the die;

outward between said sets of cutting teeth, each of said recessesterminating at substantially the same distance from the outer peripheryof the die, and slot extending from the end of one of said recesses tothe outer periphery of the die; a die holder having a conicalsurfaceformed to engage the edge of the die near its front end andproviding an abutment adapted to engage and a wedge adapted to enter theslot in the die and expand `the die so as to force its outer edgeuniformly against the conical surface of the die i holder.

le Ein adjustable and reversible one-piece die in the form of a splitannulus of substantially uniform width having, at its opposite ends,surfaces perpendicular` to its axis; at its outer edge, conical surfacestapering outwardly from each of its ends; and, at its inner edge, spacedinward projections provided with cutting teeth.

5. The combination of a reversible die containing a slot and having ateach of its ends surfaces perpendicular to its anis and having its edgeformed to provide conical surfaces tapering outwardly from each of itsends; a die holder having an abutment surface perpendicular to its asisadapted to engage either end of the die and a conical surface in frontof said abutment surface and tapering outwardly toward said abutmentsurface adapted to engage either conical surface of the die; and a wedgeextending into the die in a direction toward the conical surface of thedie holder and adapted to expand the die and force it into contact withthe conical surface of the die holder.

5. The combination of a reversible die containing a slot and having ateach of its ends surfaces perpendicular to its anis and having its edgeformed to provide conical surfaces tapering outwardly from each of itsends; a die holder having an abutmentv surface perpendicular to its axisadapted to engage either end of the die and a conical surface in frontof said abutment surface and tapering outwardly toward said abutmentsurface adapted to engage either conical surface of the die; and aradial wedge adapted to enter the slot inthe die to enpand the die so asto force the die against the conical surface and the abutment surface ofthe die holder.

7. The combination of a die holder having a longitudinal shank, a bodymounted on one end of said shank and adapted to be rotated thereby, saidbody having a plane surface extending completely across its outer endand lying perpendicular to the airis of the shank, and a hood mountedupon said body extending forwardly from said plane surface and having onits extending portion an internal conical surface; and a die havg anexternal conical surface adapted to i gage the conical surface of thehood and a rear surface perpendicular to its anis a 1apted to engage theplane surface of the body.

8. The combination of a die holder having'a longitudinal shank, a bodymounted on one end of said shanlr, a driving connection between saidshank and body, and a hood mounted upon said body so as to be adjustablelongitudinally of the body and so as to be rotated by the rotation ofthe body, said hood having at its outer end an internal conical surface;die containing a slot and having an external conical surface adapted toengage the conical surface of the hood; and a pin mounted on said hoodand extending into the slot of said die adapted to expand the die and toform a driving connection between the hood and the die.

9. The combination of a die holder, comprising a rotatable body having aplane abutment surface extending completely across its outer end, a hoodhaving a threaded connection with said body and en tending forwardlyfrom said abutment surface and having at its outer end a taperingengaging surface, means for rotating said body in a direction tending tocause said body to screw into said hood so as to bring its abutmentsurface nea-rer said tapering surface, and a die formed to extendbetween said tapering surface and said abutment surface and serving byengagement with said surfaces to prevent inward movement of the body inthe hood so that the rotation of the body is transferred to the' hoodand die.

10. The combination of a one-piece die having an external conicalsurface and containing an inwardly tapering longitudinal slot of uniformtransverse section, a die holder having an internal conical surface.,means for varying the relative longitudinal position of said conicalsurfaces, and a wedge having a threaded connection with the die holderand a tapering portion entendinq radially into the slot in the die andadapted to expand the die uniformly so as to force its conical surfaceinto uniform contact with the conical surface of the die holder invarious di'erent longitudinal re lations of these surfaces.

il. The combination of die holder having a body providing an abutmentsurface perpendicular to the axis of the die holder, a hood mounted uponsaid body, extending forwardly from said abutment surface and having onits extending portion an internal conical surface, means for adjustingsaid hood longitudinally of said body so as to vary the distance betweenthe abutment surface and the conical surface, a die containing a slotand having an externa-l conical surface adapted to engage the conicalsurill) ias

face of the hood, and a rear surface perpendicular to its axis adaptedto engage the abutment surface of the body, and a wedge extendingthrough the hood into the die and adapted to expand the die so as toioroe its conical surface into contact with the conical surface of thehood.

12. The combination of a die holder having a body providing an abutmentsurface perpendicular to the axis of the die holder, a hood having athreaded engagement with the body extending forwardly from said abutmentsurface and having on its extending portion an internal conical surface,a die containing an inwardly tapering longitudinal slot and having anexternal conical surface adapted to engage the conical aur-1 face of thehood and a rear surface perpendicular to its axis adapted to engage theabutment of the body, and a wedge positioned radially of the die and dieholder having a threaded connection with the hood and a tapered portionadapted to enter the slot in the die.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

LOUlS B. HASBROUCK.

'Witnessesz J. C. FERGUSON, H. E. VAN Nissa.

